Question Migration to new VPS - where to copy backup upload folders

[hubert]

Dear friends, hello. I am trying to migrate from plesk Reseller on one Vps to plesk (not reseller) on the other VPS. I have made a backup file of everything but it's 29GB and I am considering maybe moving files from Reseller to Plesk. Which folders shall I copy not to loose any data especially emails. We have 10 domains and on one of them 15 extremely important email accounts which have to be copied 1:1 without loosing even one byte. I would like to do it with ftp, I have root accesses to Plesk only, no to reseller. (I just call them like this to make it clear).


Thx for Your advice.
hubert